While the team insisted that they saw no sign that Jackson was using drugs, Phillips said worries mounted that Jackson did not have the energy to endure. His weight showed signs of wear and tear.
"Kenny [Ortega] used to cut his chicken breast for him and feed him," Phillips said. "I actually, in the last week, brought in someone whose sole purpose it was to remind him to eat. That was my biggest concern, was his weight."
Jackson told Ortega he had issues with insomnia.
"He would say to me, 'I didn't sleep much last night,'" Ortega said shortly after Jackson's death. "If he got inspired, then he would work on a song, work on a lyric. He would go downstairs and work in his room and work on a dance step or call me on the phone at 3 o'clock."
Still, those who saw the final dress rehearsals were shocked that the man they saw dancing on stage would die less than 48 hours later. Phillips said last month that releasing the initial footage of Jackson rehearsing was an attempt to set the record straight about the icon in his final days.
"It was thrilling," he said. "It [the rehearsal video] shows his commitment and his capability -- and one of the great entertainers."
ABC News' Chris Connelly and Lauren Sher contributed to this report.